6 papers · 1 filter
A Mass Measurement for the Missing Baryons in the Warm-Hot Intergalactic Medium via the X-ray Forest
F. Nicastro, S. Mathur, M. Elvis +7
Recent Cosmological measurements indicate that baryons comprise about four percent of the total mass-energy density of the Universe, which is in accord with the predictions arising…
X-ray properties of the "Composite" Seyfert/Star-forming galaxies
A. Wolter, G. Trinchieri, R. Della Ceca +7
An enigmatic, small class of IR and X-ray luminous sources, named ``Composite'' starburst/Seyfert galaxies, has been defined from IRAS and RASS data. The objects have optical spect…
The Chandra High Resolution Spectra of Mkn 421
F. Nicastro, A. Fruscione, M. Elvis +3
Mkn 421 was observed by Chandra twice, on November 5, 1999 as part of the Chandra calibration program, with the ACIS-HETG configuration, and on May 29, 2000 following our Target Of…
The Chandra Multi-wavelength Project (ChaMP): a serendipitous survey with Chandra archival data
B. J. Wilkes, P. Green, R. Brissenden +34
The launch of the Chandra X-ray Observatory in July 1999 opened a new era in X-ray astronomy. Its unprecedented, <0.5" spatial resolution and low background are providing views of…
Mrk421: EUVE observations from 1994 to 1997
Ilaria Cagnoni, Antonella Fruscione, Iossif E. Papadakis
We present spectral and timing analysis of all the data collected by the Extreme Ultraviolet Explorer for the BL Lac object Mrk 421 from 1994 to 1997. During these years Mrk 421 ha…
EUVE-RXTE simultaneous observations of NGC 4051: variability and spectrum
I. Cagnoni, A. Fruscione, I. M. McHardy +1
We present timing and spectral analysis of the data collected by the Extreme Ultraviolet Explorer Satellite (EUVE) for the Seyfert 1 galaxy NGC 4051 during 1996. NGC 4051 was obser…